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Head-to-head evidence comparison — which supplement is right for you?
Magnesium and Myo-Inositol are closely matched across evidence, studies, and safety.
Verdict
Likely helps
13 of 17 studies with measurable effects showed benefit.
Top outcomes
Verdict
Probably helps
7 of 12 studies with measurable effects showed benefit.
Top outcomes
200-350mg elemental magnesium daily
Evening for sleep/relaxation (glycinate), Morning for energy (malate), Anytime (citrate)
Depends on goal - see notes
2-4g daily for PCOS; up to 12-18g for anxiety
Divided doses with meals, Morning and evening
Myo-inositol powder
1-2 weeks
1-2 weeks
1 week
Immediate
3-6 months
4-6 weeks
2-3 months
Initial use or high doses
Magnesium supplementation in pregnancy
The Cochrane database of systematic reviews (2014) · Meta analysis · n=9090
Women receiving magnesium were significantly less likely to require hospitalisation during pregnancy (RR 0.65, 95% CI 0.48 to 0.86; three trials, 1158 women).Of the 10 trials included in the review, only two were judged to be of high quality overall.
Magnesium Supplementation and Blood Pressure: A Systematic Review and Meta-Analysis
Hypertension (2025) · Meta analysis · n=2709
38 RCTs with 2709 participants analyzed
Magnesium and Potassium Supplementation for Systolic Blood Pressure Reduction in the General Normotensive Population: A Systematic Review and Subgroup Meta-Analysis for Optimal Dosage and Treatment Length
Nutrients (2024) · Meta analysis
Both supplements demonstrated greater reductions in SBP for the general population at lower dosages and longer treatment durations.
Antenatal dietary supplementation with myo-inositol for preventing gestational diabetes
The Cochrane database of systematic reviews (2023) · Meta analysis · n=1319
For the primary neonatal outcomes, only one study measured the risk of a large-for-gestational-age infant and found myo-inositol was associated with both appreciable benefit and harm (RR 1.40, 95% CI 0.65 to 3.02; 1 study, 234 infants; low-certainty evidence).
Inositol Nutritional Supplementation for the Prevention of Gestational Diabetes Mellitus: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Nutrients (2022) · Meta analysis · n=1321
Pooled results were expressed as relative risk (RR) or mean difference (MD) with a 95% confidence interval (95% CI).
Short period-administration of myo-inositol and metformin on hormonal and glycolipid profiles in patients with polycystic ovary syndrome: a systematic review and updated meta-analysis of randomized controlled trials
European review for medical and pharmacological sciences (2022) · Meta analysis · n=612
Compared with metformin, the suitable supplemental dosage of myo-ins may be helpful in lowering levels of TG and avoiding adverse events (AEs).
Based on meta-analysis of 38 RCTs with 2709 participants showing -7.68 mmHg reduction in hypertensive individuals. Effects are greatest in those with hypomagnesemia. Limited evidence in normotensive populations.
Based on multiple meta-analyses showing improved menstrual regularity and ovulation in PCOS. Evidence quality varies across studies with some showing minimal differences vs placebo. 4g daily most commonly studied dose.
AI-estimated from published studies. Interpret as directional guidance.
Both Magnesium and Myo-Inositol are closely matched — the best choice depends on your specific health goals.
For support mood, Myo-Inositol has a higher relevance score (90 vs 60).
No known interactions between Magnesium and Myo-Inositol have been documented in our database. However, always consult a healthcare provider before combining supplements.